Literary usage of Duckbills

Below you will find example usage of this term as found in modern and/or classical literature:

1.Natural History of Animals: Containing Brief Descriptions of the Animals by Sanborn Tenney (1875)"duckbills, OR MONOTREMES. These are animals which vary much from all other mammals,
having their organic structure in some respects much like that of Birds. ..."

2.The Evolution of Man by Wilhelm Bölsche (1905)"They are called duckbills because their toothless jaws are covered with a ...
Hence we conclude that the toothless bills of the duckbills, in spite of the ..."

3.The Monist by Hegeler Institute (1893)"1884. that the duckbills are egg-laying mammals, a character which certainly
could not have been acquired through degeneration, but which simply shows that ..."

4.Contributions Toward a Monograph of the Insects of the Lepidopterous Family by John Bernhard Smith (1895)"note on the way in which it carries its young, 61. remarks upon some living
duckbills in confinement at Melbourne, 63. Le Strange (II. ..."

5.Embryogeny: An Account of the Laws Govering the Development of the Animal by Hans Przibram (1908)"In most reptiles, in birds, and among mammals in the duckbills, the eggs are very
rich in yolk and surrounded by a resistant shell; in the case of some ..."